rescue SSRFProxy::HTTP::Error::InvalidResponse => e
        logger.info(e.message)
        error_msg = 'Response <- 503'
        error_msg << " <- PROXY[#{@ssrf.proxy.host}:#{@ssrf.proxy.port}]" unless @ssrf.proxy.nil?
        error_msg << " <- SSRF[#{@ssrf.url.host}:#{@ssrf.url.port}] <- URI[#{uri}]"